Could I be in danger

My ex broke up with me last week because he thought me having friends meant I would cheat. Then texted me a few days after and said it’s “just a break until he feels better” and that if I “even think of talking to anyone else I have to never talk to him again”. Aside from his stupid comment, we don’t talk so I didn’t delete/block him. I was at a party and my friend took a video of us together and in the background you could hear someone make a sexual joke. She posted it and he texted me and was like “you’re annoying. Why would you guys post something like that? How do you end up around such a weirdo? I never am around anyone like that and you always find ‘weird people’ every night it seems like”. I opened it but swiped out of it and he texted me back not even a minute after and was like “wow not gonna answer me? Ok good luck dude. Bye”. And then kept trying to ask me who the person was, why they said it, where I was, etc. He kept trying to call me a nickname he gave me way back when we first started talking.

I was talking to my therapist about it and she asked me if I was safe. I said “I think so” and she said that he sounds really manipulative and insanely controlling. She thinks that he always just says “alright bye” or threatens to stop talking because he knows I cared. My therapist says deleting or ignoring him takes power back so I did. But could he become a danger? One girl tried to end it and he stalked her. Another he tried to push her to move in when she wanted to move on.